Subject: [PATCH v2 5/5] ARM: dts: r8a7794: add sound support

From: [email-masked] (Sergei Shtylyov)
Date: Fri, 12 Feb 2016 19:47:45 +0300

On 02/10/2016 08:14 PM, Simon Horman wrote:

>> Sorry for my un-ordered response
>>
>>> Define the generic R8A7794 part of  the sound device node.
>>> This sound device  is a complex one and comprises the Audio Clock Generator
>>> (ADG), Sampling Rate Converter Unit (SCU), Serial Sound Interface [Unit]
>>> (SSI[U]), and Audio DMAC-Peripheral-Peripheral.
>>> It is up  to the board file to enable the device.
>>>
>>> This patch is based on the R8A7791 sound work by Kuninori Morimoto.
>>>
>>> Signed-off-by: Sergei Shtylyov <[email-masked]>
>> (snip)
>>> +		rcar_sound,src {
>>> +			src1: src at 1 {
>>> +				interrupts = <GIC_SPI 353 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x87>, <&audma0 0x9c>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +			src2: src at 2 {
>>> +				interrupts = <GIC_SPI 354 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x89>, <&audma0 0x9e>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +			src3: src at 3 {
>>> +				interrupts = <GIC_SPI 355 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x8b>, <&audma0 0xa0>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +			src4: src at 4 {
>>> +				interrupts = <GIC_SPI 356 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x8d>, <&audma0 0xb0>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +			src5: src at 5 {
>>> +				interrupts = <GIC_SPI 357 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x8f>, <&audma0 0xb2>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +			src6: src at 6 {
>>> +				interrupts = <GIC_SPI 358 IRQ_TYPE_LEVEL_HIGH>;
>>> +				dmas = <&audma0 0x91>, <&audma0 0xb4>;
>>> +				dma-names = "rx", "tx";
>>> +			};
>>> +		};
>>
>> I think this can't work correctly, because driver is assuming
>> DT has all channles (from 0). (see linux/sound/soc/sh/rcar/src.c :: rsnd_src_probe)
>> Can you adds dummy src0 with some comments ? or fix src.c driver ?
>
> I would prefer the driver to be fixed (I had a similar patchset locally
> and I found it doesn't work).

    You mean you had R8A7794 sound patch set too?

> The reason is that DT should describe
> the hardware rather than the current state of the software.

    Yes, of course. Just tell me do I have to fix the driver *before* this 
patch set is accepted?

MBR, Sergei